Baal HaSulam, The Study of the Ten Sefirot, Part 1, “Table of Questions and Answers for the Meaning of the Words“: Question 25. [What is a spiritual vessel] Kli. The will to receive in the emanated being is the Kli.
However, the will to receive alone is not enough: We know that it requires the intention to bestow. In other words, this desire needs to be corrected, supplemented.
The spiritual vessel is initially created as desire: the place for receiving fulfillment. But later on, it changes and builds a new vessel above itself, which is regarded as the “screen” and the “Reflected Light.”
Before the First Restriction (Tzimtzum Aleph), the emanated being’s will to receive served as the vessel for the Light. But afterwards, by the decision of the lower ones and with the approval of the upper one, the vessel for the Light can only be the screen and the Reflected Light created by the emanated being, instead of its primordial desire to receive pleasure that it has rejected as defective for receiving the Light.
Desire is a raw material that is handed to us from Above through the informational genes (Reshimot), the influence of the upper Light. It isn’t up to the creature. But the latter says: “I reject this vessel given to me to receive the treats, and I refuse to work in this way! I don’t wish this egoistic desire to control me as a blind instinct!” I don’t want to forget who I am and thoughtlessly do only whatever pleases me. I want to make every move with an understanding, consciously, upon my own examination and according to my decision.”
“This is the way I wish to be now, from now on and forever! Please help me to become it, I am begging you! I don’t wish to remain a beast; I wish to become a human! To be human means to know who you are and make your own decisions. Please give me this chance! From now on, let us agree that the vessel (desire) that You created in me is unfit. Give me a chance to choose on my own how to use if first. And then, the screen and the Reflected Light become the vessel.
I plead with You so that You build this vessel for me, which I don’t naturally possess. I hate my selfish nature that makes me act unconsciously. I don’t want it. I want to be aware of what is going on with me from the beginning to the end and to choose on my own.”
In that case, I receive an opportunity to make clear, precise, and allegedly final choices regarding everything that concerns my nature: about reception and our relationship with Him, which will be regarded as my spiritual vessel. It is a device that I created to be able to receive the treats from the Host.
The primordial desire remains since without it, it’s impossible to do anything. But where I am concerned, I don’t wish to use it to act. The new desire requires of me to learn how the Host feels about me and how I can become similar to Him, and I reveal my primordial desire only in accordance with it.
This means that we do not reject the natural desire as it is, but only its “traditional” use.
From the 3rd part of the Daily Kabbalah Lesson 6/22/2011, Talmud Eser Sefirot